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"[E]nhanced border enforcement may have contributed to a number of secondary costs and benefits. To the extent that border enforcement successfully deters illegal entries—an effect that is also difficult to measure since deterrence ultimately involves decisions made in towns and villages far...

"Drawing on multiple data sources, the report suggests conclusions about the state of border security. Robust investments at the border were not associated with reduced illegal inflows during the 1980s and 1990s, but a range of evidence suggests a substantial drop in illegal inflows in 2007-2011...